-1-8+9m=8m-20

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Solution for -1-8+9m=8m-20 equation: 



-1-8+9m=8m-20

We move all terms to the left:

-1-8+9m-(8m-20)=0

We add all the numbers together, and all the variables

9m-(8m-20)-9=0

We get rid of parentheses

9m-8m+20-9=0

We add all the numbers together, and all the variables

m+11=0

We move all terms containing m to the left, all other terms to the right

m=-11

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